Following statements are related to the Epigenetic regulation of Hox gene expression in the chick limb .

A. Hoxa13 is normally not expressed during early limb bud outgrowth.

B. Hoxa13 is normally expressed during early limb bud outgrowth.

C. Inhibition of histone deacetylases with a TSA-coated bead implanted into the early limb bud results in precocious Hoxa13 expression and specifically reduced skeletal elements of the zeugopod

D. Inhibition of HAT proteins with a TSA-coated bead implanted into the early limb bud results in Hoxa13 expression and specifically reduced skeletal elements of the zeugopod

E. The epigenetic hold on gene Hoxa13 expression to allow the necessary time for zeugopod development.

F. The epigenetic hold on gene Hoxa13 expression to allow the necessary time for autopod development.

Which of the following combinations are correct?

TLS Online TPP Program

#Question id: 10409

#Unit 6. System Physiology – Plant

Three main classes of photoreceptors mediate the effects of UV-A/blue light:

a) the cryptochromes,

b) the phototropins,

c) the phytochrome and

d) the ZEITLUPE (ZTL)

Function of these photoreceptors are-

i) that can promote plant photomorphogenesis

ii) plays roles in day length perception and circadian rhythms

iii) regulate chloroplast movements, and stomatal opening

TLS Online TPP Program

#Question id: 10410

#Unit 6. System Physiology – Plant

phytochrome red and far-red light. Given below experiment of lettuce seed, which of the following option will be incorrect?

TLS Online TPP Program

#Question id: 10411

#Unit 6. System Physiology – Plant

Phytochrome chromophore which absorbs light known as Phytochromobilin , that are synthesized in

TLS Online TPP Program

#Question id: 10412

#Unit 6. System Physiology – Plant

Red and far-red lights are perceived by plants through various photoreceptors including phytochromes. The red/far-red reversibility of seed germination was due to the-

a) photoreversibility of phytochrome

b) presence of red and far-red light at different fluence rate

c) Conversion of Pr to Pfr form through the effect of red light

d) equal proportion of red and far red light at same fluence rate

Which of the following combinations is correct?

TLS Online TPP Program

#Question id: 10413

#Unit 6. System Physiology – Plant

Following are certain statements are related to the effect of red and far-red light;

a) under a dense canopy much of the red light is absorbed by plant pigments, resulting in transmittance of mostly far-red light

b) Pr (red) has highest photon flux at 680 nm while Pfr (far-red) has highest photon flux at 730nm

c) Pfr far-red light–absorbing form, which is considered to be the physiologically active form of phytochrome

d) R:FR ratio is strongly affected by the presence of a canopy because chlorophyll absorbs far-red but not red light

Which one of the combinations of above statements is incorrect?

TLS Online TPP Program

#Question id: 10413

#Unit 1. Structure and Function of Biomolecules

Following are certain statements are related to the effect of red and far-red light;

a) under a dense canopy much of the red light is absorbed by plant pigments, resulting in transmittance of mostly far-red light

b) Pr (red) has highest photon flux at 680 nm while Pfr (far-red) has highest photon flux at 730nm

c) Pfr far-red light–absorbing form, which is considered to be the physiologically active form of phytochrome

d) R:FR ratio is strongly affected by the presence of a canopy because chlorophyll absorbs far-red but not red light

Which one of the combinations of above statements is incorrect?